Knight & Castle

Play real chess offline against Stockfish—and understand every move with clear AI feedback. Knight & Castle is a focused chess trainer for players who want a strong opponent, practical move feedback, and a clean board—without an account, matchmaking, or an internet connection. PLAY AND IMPROVE OFFLINE • Play against Stockfish from Beginner to Expert • Choose White or Black • No account or online opponent required • Practice anywhere, even without Wi-Fi or cellular data UNDERSTAND EVERY MOVE After each move, see whether it was a Best Move, Good Move, Inaccuracy, Mistake, or Blunder. Compare your move with the engine’s recommended alternative and find the moment that changed the game. Whether you are learning the rules or sharpening your strategy, Knight & Castle helps you improve at your own pace. ■ Five difficulty levels Choose Beginner, Easy, Medium, Hard, or Expert, and play as White or Black. ■ Move review & AI coach The engine grades every move you make. An on-device AI coach explains in plain language what worked, what did not, and what to focus on next. When the game ends, Game Review summarizes your accuracy, key moments, and the moves that mattered most. ■ Learning mode • Hint: see a recommended move when you are stuck • Undo: take back your last move • Move history: revisit any position • Opening names: recognize the opening you are playing • Share your game: export it as PGN ■ Made for iPhone, iPad, and iPhone Duo Play in portrait or landscape. On iPhone Duo, fold the device for a board-first view or unfold it for a larger board beside the control panel. ■ More features • Toggle board coordinates (a–h, 1–8) • Resume your game after closing the app • The chess engine runs on your device, so you can play offline The AI coach comments require a device that supports Apple Intelligence. On other devices, the engine still grades each move and shows the recommended alternative.